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Position measurement reference sheet, image forming apparatus, and image position measurement method

a technology of image forming apparatus and reference sheet, which is applied in the direction of electrical equipment, pictoral communication, etc., can solve the problems of reading error degrading accuracy and error arising from measurement errors

Active Publication Date: 2016-09-22
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a position measurement reference sheet that helps to accurately measure the position of an image on a recording medium. The sheet has a recording medium detection window and an image detection window, and it is placed between the image reading device and the recording medium. The image forming apparatus includes the image forming device, the reading device, and the image position adjuster to adjust the position of the image on the recording medium based on the measurement result obtained by the reading device. The method involves placing the position measurement reference sheet on the recording medium and reading it from a side of the reference sheet, distinguishing the densities of the reference sheet, the recording medium, the image on the recording medium, and a background to measure the position of the image on the recording medium relative to the recording medium. The technical effect of this invention is to provide a more accurate reference for measuring image position on a recording medium.

Problems solved by technology

However, it is possible that the size of the area readable by the scanner vary depending on individual differences and accuracy in measurement is degraded by reading errors.
For example, in a line-sensor type scanner, errors arise due to uneven feeding speed of a sensor.

Method used

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  • Position measurement reference sheet, image forming apparatus, and image position measurement method
  • Position measurement reference sheet, image forming apparatus, and image position measurement method
  • Position measurement reference sheet, image forming apparatus, and image position measurement method

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0065]Descriptions are given below of the measurement reference sheet and an image position measurement method using the measurement reference sheet according to a

[0066]In the first embodiment, a measurement reference sheet 26 illustrated in FIG. 3 is used. The measurement reference sheet 26 includes sheet detection windows 27a, 27b, and 27c (also collectively “sheet detection windows 27”) to detect the position of an end of the sheet P and image detection windows 28a, 28b, 28c, and 28d (also collectively “image detection windows 28”) to detect the position of the image on the sheet P. Relative positions among the sheet detection windows 27 and the image detection windows 28 of the measurement reference sheet 26 are accurately calculated and used to calculate the position of the sheet P and the position of the image on the sheet P.

[0067]In the image position measurement according to the present embodiment, the image B for adjustment (hereinafter also “adjustment image B”) is printed...

second embodiment

[0084]Next, descriptions are given below of a measurement reference sheet 262 according to a

[0085]As illustrated in FIG. 9, in the measurement reference sheet 262, the sheet detection windows 27 and image detection windows 28 are circular. Placement of the sheet detection windows 27 and the image detection windows 28 is similar to the placement thereof in the first embodiment, and thus only the sheet detection window 27a and the image detection window 28a are illustrated in FIG. 9. Similar to the first embodiment, relative positions of the sheet detection windows 27 and the image detection windows 28 on the measurement reference sheet 262 are accurately calculated and used to calculate the position of the sheet P and the image position on the sheet P.

[0086]In the second embodiment, in each of the detection windows, the density is measured in one direction, which is indicated by arrow Y5 in FIG. 9 (hereinafter “direction Y5”).

[0087]For example, in the sheet detection window 27a, the ...

third embodiment

[0110]In view of the foregoing, FIG. 14 illustrates a measurement reference sheet which is designed for image position measurement in a state in which the top of the scanner 40 is closed.

[0111]In the third embodiment, a liner 29 is disposed on the back (i.e., opposite the front face 260 facing the scanner glass 45) of the measurement reference sheet 262 as illustrated in FIG. 14. In the density measurement, the sheet P is interposed between the measurement reference sheet 262 and the liner 29. The liner 29 is a thin sheet similar to the measurement reference sheet 262.

[0112]With the liner 29, in a portion of the sheet detection windows 27 where the sheet P is not present, the density of a front side (facing the scanner glass 45) of the liner 29 is measured. The liner 29 has a color to exhibit a density (e.g., gray level) different from the density of the sheet P and that of the measurement reference sheet 262 to distinguish the boundaries of the liner 29, the sheet P, and the measu...

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Abstract

A position measurement reference sheet for image position measurement on a recording medium includes a body having a front face to face an image reading face of a reading device, a recording medium detection window in the body to measure a position of an end of the recording medium, and an image detection window in the body to measure a position of an image on the recording medium. The position measurement reference sheet is interposed between the image reading face and the recording medium.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This patent application is based on and claims priority pursuant to 35 U.S.C. §119(a) to Japanese Patent Application Nos. 2015-057211 filed on Mar. 20, 2015 and 2015-149788, filed on Jul. 29, 2015, in the Japan Patent Office, the entire disclosure of each of which is hereby incorporated by reference herein.BACKGROUND[0002]1. Technical Field[0003]The present disclosure generally relate to a position measurement reference sheet, an image forming apparatus, such as a copier, a printer, a facsimile machine, and a multifunction peripheral (MFP) having at least two of copying, printing, facsimile transmission, plotting, and scanning capabilities, that adjusts a position of an image using the position measurement reference sheet, and an image position measurement method using the position measurement reference sheet.[0004]2. Description of the Related Art[0005]In image forming apparatuses, such as copiers, printers, facsimile machines, and MFPs,...

Claims

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Application Information

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IPC IPC(8): H04N1/00H04N1/50
CPCH04N1/00705H04N1/00737H04N2201/0094H04N1/50H04N1/0032H04N1/00795H04N1/387
Inventor KISHI, YUMIKOHINO, MAKOTOMOHRI, SATOSHIMORITA, YOSHIAKIMASUDA, NORITAKAMAKINO, HIDEYOSUGA, TOMOAKIKONISHI, TAKAHIRONAKAYAMA, SATOSHI
Owner RICOH KK